/*
 * The MIT License (MIT)
 * 
 * Copyright (c) 2015 Camil Staps <info@camilstaps.nl>
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * 
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */
package com.camilstaps.week10;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.ImageIcon;
import javax.swing.JComboBox;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

/**
 * Controller for the main window
 * @author Camil Staps, s4498062
 */
public class OverviewController {
    
    /**
     * Location of the Buienradar API XML
     */
    private final static String XML_LOCATION = "http://xml.buienradar.nl";
    
    private final OverviewWindow overviewWindow;
    private List<WeatherStation> weatherStations;
    
    /**
     * Refresh button:
     *  1. Store selected weatherstation id
     *  2. Reload XML
     *  3. Restore previously selected weatherstation
     */
    private final ActionListener refreshActionListener = new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent ae) {
            if (ae.getActionCommand().equals("Refresh")) {
                int id = ((WeatherStation) overviewWindow.getWeatherStationPicker().getSelectedItem()).getId();
                
                loadXML();
                
                for (WeatherStation ws : weatherStations) {
                    if (ws.getId() == id) {
                        overviewWindow.getWeatherStationPicker().setSelectedItem(ws);
                        break;
                    }
                }
                
                loadWeatherInfo();
            }
        }
    };
    
    /**
     * When the ComboBox changes, change the information in the label accordingly
     */
    private final ActionListener newStationActionListener = new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent ae) {
            if (ae.getActionCommand().equals("comboBoxChanged")) {
                loadWeatherInfo();
            }
        }
    };
    
    /**
     * Load the XML for the first time, register ActionListeners and display info
     * @param ow 
     */
    public OverviewController(OverviewWindow ow) {
        overviewWindow = ow;
        
        loadXML();
        
        overviewWindow.getRefreshButton().addActionListener(refreshActionListener);
        overviewWindow.getWeatherStationPicker().addActionListener(newStationActionListener);
        
        loadWeatherInfo();
    }
    
    /**
     * Load XML from the Buienradar API and store in the weatherStations List.
     */
    private void loadXML() {
        try {
            DocumentBuilderFactory docBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder docBuilder = docBuilderFactory.newDocumentBuilder();
            Document doc = docBuilder.parse(XML_LOCATION);
            
            doc.getDocumentElement().normalize();
            NodeList weatherstationsList = doc.getElementsByTagName("weerstation");
            weatherStations = new ArrayList<>();
            for (int i = 0; i < weatherstationsList.getLength(); i++) {
                weatherStations.add(new WeatherStation((Element) weatherstationsList.item(i)));
            }
            Collections.sort(weatherStations);
            
            JComboBox<WeatherStation> comboBox = overviewWindow.getWeatherStationPicker();
            comboBox.removeAllItems();
            for (WeatherStation ws : weatherStations) {
                comboBox.addItem(ws);
            }
        } catch (ParserConfigurationException | SAXException | IOException ex) {
            Logger.getLogger(Week10WeatherGUI.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
    
    /**
     * Show the weather information in the display.
     */
    private void loadWeatherInfo() {
        WeatherStation selected = (WeatherStation) overviewWindow.getWeatherStationPicker().getSelectedItem();
        if (selected != null) {
            overviewWindow.getWeatherInformationDisplay().setText(selected.getWeatherDescription());
            overviewWindow.getWeatherInformationDisplay().setIcon(new ImageIcon(selected.getWeatherIcon()));
        }
    }
    
}